{
  "body": "C. de Barra (University College Dublin), P. McDermott (University College Dublin), and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team:\n\n\"At 07:35:09.28 UT on 14 August 2025, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 250814A (trigger 776849714/250814316) which was also detected by Swift BAT (R. Caputo et al. 2025, GCN 41358). The Fermi GBM on-ground location is consistent with the Swift BAT position. The GBM trigger was temporally coincident with the non-significant compact binary merger candidate S250814bg (LVK Collaboration, GCN 41364) with GBM triggering 3.7s after S250814bg.\n\nThe angle from the Fermi LAT boresight is 25 degrees.\n\nThe GBM light curve consists of a single emission episode with a duration (T90) of about 22 s (50-300 keV). The time-averaged spectrum from T0-6.1 to T0+16.4 s is best fit by a simple power law function with index -1.63 +/- 0.04.The spectrum is equally well fit by a power law function with an exponential high-energy cutoff. The power law index is -1.15+/- 0.15 and the cutoff energy, parameterized as Epeak, is 132 +/- 24 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(2.9 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+3.6 s in the 10-1000 keV band is 1.4 +/- 0.2 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"",
  "bibcode": "2025GCN.41378....1D",
  "submittedHow": "web",
  "format": "text/plain",
  "circularId": 41378,
  "createdOn": 1755202815545,
  "submitter": "Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie>",
  "subject": "GRB 240814A: Fermi GBM Observation",
  "eventId": "GRB 240814A"
}